Whats the difference or differences in the non i/c head, i/c head and the later p-pump heads? Just talking to a friend about this and no one we know has any real knowledge of the difference. Does anyone know?
Thanks

 

Only diff I know of is the non IC has the 9mm injector tips and is more prone to cracking around the injectors there might be more.

 

Yes, that is the only difference. The only difference between the I/C 1st gen head and a p-pumped head is the holes that the throttle linkage bracket bolts too are spaced a little farther apart. Completely interchangeable.

 

I wasn't sure if one flowed better than the other or if one had "bigger smaller" combustion chambers or not ect..

 

So one would have to change the throttle linkage bracket if changing to a newer head? (assuming non i/c)

 

I was curious about head differences myself,last fall I had 3 engines tore down in my shop,a 90 N/I, 93 I/C, a 97 p-pump. the 97 had smoother casting & alot more open valve bowl area,looked to flow better especially on intake side.the 93 looked very close to the 97. the big difference was between the non-intercooled,looking in the intake side the valve bowl had more casting material down in the path of flow.aside from 7 mm vs 9 mm injector bore the p-pump is notched for overflow valve removal. the cams between the 97 & 90 are way different. the 90 cam has alot more opening duration ,a better cam for performance,changed later for emmisions,I suspect. not sure what the 1st gen I/C cam looks like. the non I/C has bigger piston bowls,155* spray. intercooled are 145* smaller bowl pistons. PODS riun cleaner in NON I/C motors,power gain not as much over stock 4x.0012 injectors, lots of minor changes over the years.

 

crewcabxlt thanks for the info.. Saved me some time continuing looking for such info.. I didn't know if the diesels did like the old gasser engines and had some heads better than others. Bigger/smaller combustion chambers, valves, and port sizing. Everyone I knew didn't have an answer or have any idea.
Thanks

 

I see in your sig your trucks are all intercooled,you should be fine to work with what you have,clean up your exhaust ports,port match your exhaust manifold,I run a 3rd gen intake horn,some guys put bigger valves in, pay lots for porting etc,your money is better spent on other things,turbos,fuel delivery,even intercooler upgrade & intercooler tubing,the list can go on.good luck.

 

ive always wondered this, I have a 93 head after my dad cracked the old one.

 

crewcabxlt your right on this. The reason asking other than kicking around some ideas and not knowing for sure is I have a spare 93 i/c engine. It is just setting in the corner lonely wanting some attention. I guess it will be about 5th in line project. Since the economy has us slowed down alot I finally have time to play with my ole 1st gens just hate to spent much money. I need to find someone in the Houston or surrounding area to do some porting. I'd rather do it myself than to let some knucklehead do it, unless I can find a reputable shop. Thanks for your input.

 

the second gen ppump 12v heads flow almost 25% more air, the first gen heads are a bit weird so they dont flow as much.

 

I run a ported/O-ringed 2nd gen head and I did have to drill the existing boss for the 1st gen throttle bracket. It's no big deal . . . .





It's been my understanding that the flow differences of the generations are minor with the '93 head being more desirable for porting potential (better OEM casting) . . . . so says the folks at PDR.